Lubricator for rotary loop-takers in sewing machines



Oct. 21, 1941. A, v GALLI 2,259,442

LUBRICATOR FOR ROTARY LOOP-TAKERS IN SEWING MACHINES Filed June 16, 1959 INVENTOR. A/uro V. GHLLI.

LUzz/vum.

ATTORNEY.

Patented Oct. 21, 1941 LUBRICATOR FOR ROTARY LOOP-TAKERS IN SEWING MACHINES Aiuto V. Galli, Queens Village, N. Y. 1

Application June 16, 1939, Serial No. 279,564

Claims. (01. 112-1-256) This invention relates to sewing machines of the rotary loop-taker type, in which a thread wound bobbin is loosely carried interjacent a stationary bobbin carrier, around which is a looptaker having a hook to engage a thread loop cast by a needle and through which the bobbin is passed in the formation of a lock stitch.

Such loop-taker, operated ordinarily at a high speed of rotation, in timed relation to the rapid reciprocative movement 'of the needle, requires lubrication between it and the bobbin carrier, around which it rotates, else trouble inevitably ensues.

It is therefore the main object of this invention to provide a lubricating device, applicable directly to the loop-taker without interference with any operative part of the machine, due to its compact structure and location.

A further feature is in the provision of an efficient device adapted to supply constant lubrication in required quantities to the parts needing it, and which is easily refilled in a convenient manner without removal.

Another purpose is to produce an essentially simple lubricator consisting of a single unitary container having a filling opening and a delivery orifice, disposed closely adjacent the rotating part, no pipes, tubes, valves or other extraneous elements being required.

These advantageous objects are accomplished by the novel and practical construction and arrangement of parts hereinafter described and illustrated in the accompanying drawing, constituting a graphical component of this disclosure, and in which:

Figure 1 is a longitudinal sectional view of the base portion of a conventional type of sewing machine, showing an embodiment of the invention as applied.

Figure 2 is a front elevational view of the looptaker, bobbin carrier and lubricator at the rear.

Figure 3 is a side elevational view of the same, the lubricator showing in section.

Figure 4 is a front view of the lubricator in detail.

Figure 5 is a side view thereof.

Figure 6 is a rear view of the same.

Figure 7 is a sectional view taken on line 1-1 of Figure 5.

Figure 8 is a transverse sectional view taken on line 88 of Figure 4.

Referring in greater detail to the drawing, the numeral l5 designates in general the base of a sewing machine in which is set a throat plate I 6 55 provided with an opening I! for the passage of a needle l8.

A bracket l9, extending below the base, is bored to form a bearing for a shaft 20, timed to make one complete revolution at each reciprocation of the needle l8. i I

A bushing 2| maybe-arranged interjacent the bracket opening and shaft if desired.

A loop-taker 22- of the usual type is provided with a rearwardlyreaching hub 23 held to the shaft 2 0 by a set-screw in adjustedrelation,

Within the'loop taker is a bobbin carrier 25 having a transverse'flat bar'26 fromwhichiextends a forwardly reaching axial spindle 2T'to receive the usual form of thread holding bobbin, (not shown) which is free to move therein under pull of the thread; the bobbin carrier has a semiannular bearing rib 28 operable in a race 29 and is held from rotation by reason of a stop fixed on the frame in such manner as to present the needle passage in the carrier in registration with the throat plate opening [1.

All the foregoing parts are common and well known, given only to illustrate the invention, which consists of means to supply requisite lubrication between the stationary bobbin carrier 25 and rapidly revolving loop-taker 22.

A cylindrical metal container 30, at least equal in diameter to the loop-taker 22, has a bore 3| to fit over the hub 23, with which it is uniform in length.

The side of the container, adjacent the looptaker, may be recessed, as at 32, to receive the support arms 24 of the loop-taker and contains an opening 33 through which the head and body portion 34 of a set screw 35 is accessible, this screw holding the hub 23 of the loop-taker in adjustment.

The container has a chamber 36 to hold any preferred lubricant, enterable through an opening 31 in its periphery, normally tightly closed by a. cap screw 38 provided with a gasket under its head.

A boss 40 extends from the side of the con tainer, adjacent the loop-taker, and reaches through it nearly to the bobbin carrier, being so shaped as to avoid interference.

This boss has a small longitudinal orifice 4| communicating with the chamber 36, and is supplied with an applicator 42 such as a strand of felt or wicking, to touch the bobbin carrier, as the loop-taker is revolved therearound, furnishing a simple and highly efiicient means of lubrication.

The lubricant container 30 may be of any suittegrally with the body of the loop-taker 22, thus providing a unitary loop-taker and lubricant supply Unit.

Furthermore, if desired, the lubricant container 30 may be mounted directly on the shaft 20, adjacent the loop-taker 22, in such operative manner as to be entirely independent of the loop-taker.

The foregoing disclosure is to be regarded as descriptive and illustrative only, and not as restrictive or limitative of the invention, of which obviously an embodiment may be constructed including many modifications without departing from the general scope herein indicated and denoted in the appended claims. v

Having thus described the invention, what is Patent, is:

1. In a sewing machine, a rotary loop-taker having an internal race-way, a stationary bobbin 'adjustably mounted on said shaft adjacent said loop-taker for supplying a lubricant to said beara lateral I c. 2,259,442 -7 r able p and if preferred, may be formed in- 3. In a sewing machine, a rotary loop-taker having an internal race-way, a solid shaft for said loop-taker, a stationary bobbin carrier having a bearing rib mounted in said race-way, a self-contained lubricant container unit removably mounted on said shaft, and flexible means carried by said container for conveying a lubricant therefrom to said bearing rib.

4. In a sewing machine of the rotary loop-taker type having a stationary bobbin carrier, a looptaker revoluble circumjacent, and a revoluble shaft on which said loop-taker is fixed, a chambered container juxtaposed on said loop-taker, a

boss on said container having an orifice disposed closely adjacent said carrier, and a capillary member in said orifice extending into the path h l of said carrier. claimed as new and desired to secure by Letters;

5. In a sewing machine of the rotary loop-taker type having a stationary bobbin carrier, a solid shaft and a loop-taker fixed on said shaft, a unitary cylindrical container adjustably fixed on said shaft in direct contact with said loop-taker, boss on said container extending through said loop-taker adjacent the path of said carrier, said boss having an orifice communicating with the interior of the container, adsorbent material disposed in the orifice,v said container having a peripheral opening through which it may be supplied with a lubricant, and a screw stopper for the opening.

AIUTO V. GALLI. 

